function explode (delimiter, string, limit) {
    // Splits a string on string separator and return array of components. If limit is positive only limit number of components is returned. If limit is negative all components except the last abs(limit) are returned.
    //
    // version: 1008.1718
    // discuss at: http://phpjs.org/functions/explode
    // +     original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +     improved by: kenneth
    // +     improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +     improved by: d3x
    // +     bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: explode(' ', 'Kevin van Zonneveld');
    // *     returns 1: {0: 'Kevin', 1: 'van', 2: 'Zonneveld'}
    // *     example 2: explode('=', 'a=bc=d', 2);
    // *     returns 2: ['a', 'bc=d']

    var emptyArray = { 0: '' };

    // third argument is not required
    if ( arguments.length < 2 ||
        typeof arguments[0] == 'undefined' ||
        typeof arguments[1] == 'undefined' ) {
        return null;
    }

    if ( delimiter === '' ||
        delimiter === false ||
        delimiter === null ) {
        return false;
    }

    if ( typeof delimiter == 'function' ||
        typeof delimiter == 'object' ||
        typeof string == 'function' ||
        typeof string == 'object' ) {
        return emptyArray;
    }

    if ( delimiter === true ) {
        delimiter = '1';
    }

    if (!limit) {
        return string.toString().split(delimiter.toString());
    } else {
        // support for limit argument
        var splitted = string.toString().split(delimiter.toString());
        var partA = splitted.splice(0, limit - 1);
        var partB = splitted.join(delimiter.toString());
        partA.push(partB);
        return partA;
    }
}


/**
 * Checks if the given value exists in the array
 * @param needle
 * @param haystack
 * @param argStrict
 * @return boolean
 */
function in_array (needle, haystack, argStrict) {
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: vlado houba
    // +   input by: Billy
    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
    // *     example 1: in_array('van', ['Kevin', 'van', 'Zonneveld']);
    // *     returns 1: true
    // *     example 2: in_array('vlado', {0: 'Kevin', vlado: 'van', 1: 'Zonneveld'});
    // *     returns 2: false
    // *     example 3: in_array(1, ['1', '2', '3']);
    // *     returns 3: true
    // *     example 3: in_array(1, ['1', '2', '3'], false);
    // *     returns 3: true
    // *     example 4: in_array(1, ['1', '2', '3'], true);
    // *     returns 4: false

    var key = '', strict = !!argStrict;

    if (strict) {
        for (key in haystack) {
            if (haystack[key] === needle) {
                return true;
            }
        }
    } else {
        for (key in haystack) {
            if (haystack[key] == needle) {
                return true;
            }
        }
    }

    return false;
}


/**
 * Returns true if variable is an array
 * @param mixed_var
 * @return boolean
 */
function is_array (mixed_var) {
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Legaev Andrey
    // +   bugfixed by: Cord
    // +   bugfixed by: Manish
    // +   improved by: Onno Marsman
    // +   improved by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
    // %        note 1: In php.js, javascript objects are like php associative arrays, thus JavaScript objects will also
    // %        note 1: return true  in this function (except for objects which inherit properties, being thus used as objects),
    // %        note 1: unless you do ini_set('phpjs.objectsAsArrays', true), in which case only genuine JavaScript arrays
    // %        note 1: will return true
    // *     example 1: is_array(['Kevin', 'van', 'Zonneveld']);
    // *     returns 1: true
    // *     example 2: is_array('Kevin van Zonneveld');
    // *     returns 2: false
    // *     example 3: is_array({0: 'Kevin', 1: 'van', 2: 'Zonneveld'});
    // *     returns 3: true
    // *     example 4: is_array(function tmp_a(){this.name = 'Kevin'});
    // *     returns 4: false

    var key = '';
    var getFuncName = function (fn) {
        var name = (/\W*function\s+([\w\$]+)\s*\(/).exec(fn);
        if (!name) {
            return '(Anonymous)';
        }
        return name[1];
    };

    if (!mixed_var) {
        return false;
    }

    // BEGIN REDUNDANT
    this.php_js = this.php_js || {};
    this.php_js.ini = this.php_js.ini || {};
    // END REDUNDANT

    if (typeof mixed_var === 'object') {

        if (this.php_js.ini['phpjs.objectsAsArrays'] &&  // Strict checking for being a JavaScript array (only check this way if call ini_set('phpjs.objectsAsArrays', 0) to disallow objects as arrays)
            (
            (this.php_js.ini['phpjs.objectsAsArrays'].local_value.toLowerCase &&
                    this.php_js.ini['phpjs.objectsAsArrays'].local_value.toLowerCase() === 'off') ||
                parseInt(this.php_js.ini['phpjs.objectsAsArrays'].local_value, 10) === 0)
            ) {
            return mixed_var.hasOwnProperty('length') && // Not non-enumerable because of being on parent class
                            !mixed_var.propertyIsEnumerable('length') && // Since is own property, if not enumerable, it must be a built-in function
                                getFuncName(mixed_var.constructor) !== 'String'; // exclude String()
        }

        if (mixed_var.hasOwnProperty) {
            for (key in mixed_var) {
                // Checks whether the object has the specified property
                // if not, we figure it's not an object in the sense of a php-associative-array.
                if (false === mixed_var.hasOwnProperty(key)) {
                    return false;
                }
            }
        }

        // Read discussion at: http://kevin.vanzonneveld.net/techblog/article/javascript_equivalent_for_phps_is_array/
        return true;
    }

    return false;
}